arm64: dts: freescale: imx8mm-phyboard-polis: Add TPM node

Add TPM node for phyBOARD-Polis i.MX 8M Mini which has the Infineon-SLB
9670 TPM2.0 module populated.

Signed-off-by: Yashwanth Varakala <y.varakala@phytec.de>
Signed-off-by: Yannic Moog <y.moog@phytec.de>
Signed-off-by: Cem Tenruh <c.tenruh@phytec.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>